Remember when Diablo II was all dark scary gothic horror dungeons and nothing else? As someone who played past the first act... no.
I remember: Forest (Blue zombies), caves (red imps, green zombies), crypts (bright blue demon women), a church (Bright green/purple spiders, though goatmen too), a brightly lit desert (the greyest creatures in the game), the sewers (green zombies), the harem (Bright red multi-armed things. Multicoloured skeleton mages), the maggot lairs (bright blue beetles), the brightly lit escheresque level (More dark creatures. Brown/black goatmen and ...vampires?), the tombs (skeletons, usually fairly muted admittedly), a jungle (midgets!, bright green frogs, brightly coloured zealots), the tombs (with usually, admittedly mostly dark creatures on dark backdrops), heaven/hell lit up with endless lava, brightly coloured demons, mount arreat (more brightly lit backdrop, more dingy brown creatures again), with darker areas having brighter creatures again, with the exception being those skeletons that kept getting back up.
That was Diablo II. How the hell it managed to meet the standards of the people complaining I'll never know.
Seriously [http://img2.imageshack.us/img2/4105/screenshot044u.jpg]. It wasn't dark and dingy the whole way through, and the auras were colourful as hell. (Salvation anybody? Multicoloured balls of light? The skeletal mages you could summon?)
The creatures were ghosts (Bright blue on dark backdrops), bright red skeletons, bright green/blue demons, bosses were often a single interchangeable one coloured blob. (Red Diablo was quickly followed in harder modes by... what was it green and blue?)
All of that was to avoid the look and problems of the player created comparisons for "How DIII should look".
What about those colourless muted player abilities? Poison Nova? [http://media.giantbomb.com/uploads/0/5860/459460-diablo2_4_super.jpg] Baal's bright yellow attacks? Giggling midgets standing on each others shoulders?
Come on guys. It's just unreasonable to take the darkest parts of wow (the throne room in Lordareon) and compare it to Diablo III to show they're the same. The throne room itself, isn't exactly how WoW looks [http://www.blogcdn.com/wow.joystiq.com/media/2007/01/hawkstrider_screen.jpg].
EDIT: Whoops. Forgot the cow level.